# Configuring Pleroma
In the `config/` directory, you will find the following relevant files:
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* `config.exs`: default base configuration
* `dev.exs`: default additional configuration for `MIX_ENV=dev`
* `prod.exs`: default additional configuration for `MIX_ENV=prod`
Do not modify files in the list above.
Instead, overload the settings by editing the following files:
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* `dev.secret.exs`: custom additional configuration for `MIX_ENV=dev`
* `prod.secret.exs`: custom additional configuration for `MIX_ENV=prod`
`rewrite_policy` specifies which MRF policies to apply.
It can either be a single policy or a list of policies.
Currently, MRFs availible by default are:
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* `Pleroma.Web.ActivityPub.MRF.NoOpPolicy`
* `Pleroma.Web.ActivityPub.MRF.DropPolicy`
* `Pleroma.Web.ActivityPub.MRF.SimplePolicy`